Lexus GS300/400 (2000 year). Service manual — part 150

A02678

Z09736

105 mm

EM7639

A02680

–

ENGINE MECHANICAL (2JZ–GE)

CYLINDER BLOCK

EM–85

1439

9.

INSPECT PISTON RING GROOVE CLEARANCE

Using a feeler gauge, measure the clearance between new pis-
ton ring and the wall of the piston ring groove.

Ring groove clearance:

No.1

0.011 – 0.070 mm (0.0004 – 0.0028 in.)

No.2

0.030 – 0.070 mm (0.0012 – 0.0028 in.)

If the clearance is not as specified, replace the piston.

10.

INSPECT PISTON RING END GAP

(a)

Insert the piston ring into the cylinder bore.

(b)

Using a piston, push the piston ring a little beyond the bot-
tom of the ring travel, 105 mm (4.13 in.) from the top of the
cylinder block.

(c)

Using a feeler gauge, measure the ring end gap.
Standard ring end gap:

No.1

0.300 – 0.470 mm (0.0118 – 0.0185 in.)

No.2

0.350 – 0.520 mm (0.0138 – 0.0205 in.)

Oil (Side rail)

0.130 – 0.450 mm (0.0051 – 0.0177 in.)

Maximum ring end gap:

No.1

1.07 mm (0.0421 in.)

No.2

1.12 mm (0.0441 in.)

Oil (Side rail)

1.05 mm (0.0413 in.)

If the end gap is greater than maximum, replace the piston ring.
If the end gap is greater than maximum, even with a new piston
ring, replace the cylinder block.

11.

INSPECT PISTON PIN FIT

At 80

°

C (176

°

F), you should be able to push the piston pin into

the piston pin hole with your thumb.

Z02381

Z02382

P02275

EM0227

EM–86

–

ENGINE MECHANICAL (2JZ–GE)

CYLINDER BLOCK

1440

12.

INSPECT CONNECTING ROD ALIGNMENT

Using a feeler gauge and rod aligner, check the connecting rod
alignment.

Check for out–of–alignment

Maximum out–of–alignment:
0.05 mm (0.0020 in.) per 100 mm (3.94 in.)

If out–of–alignment is greater than maximum, replace the con-
necting rod assembly.

Check for twist

Maximum twist:
0.15 mm (0.0059 in.) per 100 mm (3.94 in.)

If twist is greater than maximum, replace the connecting rod as-
sembly.

13.

INSPECT PISTON PIN OIL CLEARANCE

(a)

Using a caliper gauge, measure the inside diameter of the
connecting rod bushing.
Bushing inside diameter:
22.005 – 22.014 mm (0.8663 – 0.8667 in.)

(b)

Using a micrometer, measure the piston pin diameter.
Piston pin diameter:
21.997 – 22.006 mm (0.8660 – 0.8664 in.)

(c)

Subtract the piston pin diameter measurement from the
bushing in side diameter measurement.
Standard oil clearance:
0.005 – 0.011 mm (0.0002 – 0.0004 in.)
Maximum oil clearance:
0.05 mm (0.0020 in.)

If the oil clearance is greater than maximum, replace the bush-
ing. If necessary, replace the piston and piston pin as a set.

P02459

About
20 mm

Compressed

P02153

Z02383

–

ENGINE MECHANICAL (2JZ–GE)

CYLINDER BLOCK

EM–87

1441

14.

INSPECT CONNECTING ROD BOLTS

Using vernier calipers, measure the minimum diameter of the
compressed bolt at the measuring point.

Standard diameter: 8.1 – 8.3 mm (0.319 – 0.327 in.)
Minimum diameter: 8.0 mm (0.315 in.)

If the diameter is less than minimum, replace the connecting rod
bolt.

15.

INSPECT CRANKSHAFT FOR RUNOUT

(a)

Place the crankshaft on V–blocks.

(b)

Using a dial indicator, measure the circle runout at the
center journal.
Maximum circle runout: 0.06 mm (0.0024 in.)

If the circle runout is greater than maximum, replace the crank-
shaft.

16.

INSPECT MAIN JOURNALS AND CRANK PINS

(a)

Using a micrometer, measure the diameter of each main
journal and crank pin.
Main journal diameter:

STD

61.984 – 62.000 mm (2.4403 – 2.4409 in.)

U/S 0.25

61.745 – 61.755 mm (2.4309 – 2.4313 in.)

Crank pin diameter:

STD

51.982 – 52.000 mm (2.0465 – 2.0472 in.)

U/S 0.25

51.745 – 51.755 mm (2.0372 – 2.0376 in.)

If the diameter is not as specified, check the oil clearance.
(See page

EM–76

)

(b)

Check each main journal and crank pin for taper and out–
of–round as shown.
Maximum taper and out–of round:
0.02 mm (0.0008 in.)

If the taper or out–of–round is greater than maximum, grind or
replace the crankshaft.
17.

IF NECESSARY, GRIND AND HONE MAIN
JOURNALS AND/OR CRANK PINS

Grind and hone the main journals and/or crank pins to the
finished undersized diameter (See procedure step 16).

Install new main journal and/or crank pin undersized
bearings.

P04793

SST

EM0DM–03

P04799

Oil Hole

EM6535

P02143

P04473

EM–88

–

ENGINE MECHANICAL (2JZ–GE)

CYLINDER BLOCK

1442

REPLACEMENT

1.

REPLACE CONNECTING ROD BUSHING

(a)

Using SST and a press, press out the bushing.
SST

09222–30010

(b)

Align the oil holes of a new bushing and the connecting
rod.

(c)

Using SST and a press, press in the bushing.
SST

09222–30010

(d)

Using a pin hole grinder, bore the bushing to obtain the
standard specified clearance (See page

EM–83

) be-

tween the bushing and piston pin.

(e)

Check the piston pin fit at room temperature.
Coat the piston pin with engine oil and push it into the con-
necting rod with your thumb.

2.

REPLACE CRANKSHAFT FRONT OIL SEAL

HINT:
There are 2 methods (a) and (b) to replace the oil seal as fol-
lows:
(a)

If the oil pump is removed form the cylinder block.
(1)

Using a screwdriver, pry out the oil seal.